Parameter Mismatches and Perfect Anticipating Synchronization in bi-directionally coupled external cavity laser diodes

We study perfect chaos synchronization between two bi-directionally coupled external cavity semiconductor lasers and demonstrate for the first time that mismatches in laser photon decay rates can explain the experimentally observed anticipating time in synchronization.Comment: Latex 4 page

Observations on the maturation and spawning of the Brown Pomfret, Parastromateus niger (Bloch) in Saurashtra waters

The biology of the Brown Pomfret, Parastromatells niger (Bloch), has not been studies so far, though it forms a fishery of considerable importance along all the Indian coast and a major fishery along that or Saurashtra. Our knowledge on pomfrets is very meagre, being restricted to the general accounts given by Chidambaram & Venkataraman (1946), Moses (1947), Devanesan & Chidambaram (1948), and other fisheries reports. Rege (1958) made a preliminary study on the biology of the Silver Pomfret, Pampus argenteus (Bloch), in Bombay waters

Secrecy-preserving reasoning in simple description logic knowledge bases

In this dissertation, we study the problem of secrecy-preserving query answering (SPQA) against knowledge bases (KBs) under the open world assumption (OWA) - the assumption that typical KBs are incomplete. Protection of secret information is a critical requirement for the design of information systems in semantic web applications. Recently, semantic web technolo- gies are widely used in many application domains like healthcare, bioinformatics, intelligence and national security. So, there is a pressing need for developing robust secret protection mech- anisms suitable for ontology-based information systems. In our work, we use a logical approach to enforce secrecy where the domain knowledge is represented in an appropriate description logic (DL). In particular, to protect secret information we take advantage of OWA. Under OWA, a querying agent cannot distinguish whether a query is being protected or it cannot be inferred from the KB. The central idea in our approach to protect the secret information is to build a logical shield called “envelope” around the confidential information and answers queries correctly as much as possible without compromising the secrecy. We have chosen lightweight DL languages like DL-LiteR and ELH for studying SPQA problem with single querying agent in the first half of this dissertation. We have considered DL-LiteR KB with acyclic TBox and the secrecy set containing both assertional queries and Boolean Conjunctive Queries (BCQs). By computing a suitable envelope, we protect the secrets in the secrecy set. We have used Kleenes 3-valued semantics to prove the correctness of the query answering procedure. We have also performed a detailed analysis of computational complexities of various algorithms used in this dissertation. In ELH logic, we define a secrecy set that contains both assertional and general concept inclusion queries. A new strategy has been employed to construct the SPQA system for the given ELH KB. This includes designing efficient query answering algorithms based on recursive decomposition of queries and have shown that the query answering algorithms are sound and complete, thus providing correctness proof. In the second half of this dissertation, we have studied the SPQA problem in ELH♦ (ELH augmented with modal operator ♦). Given a ELH♦ KB and a finite secrecy set, we compute a SPQA system in the form of a tree, called secrecy-preserving tree. In this case the secrecy set contains only assertions. Since the information available in secrecy-preserving tree is not sufficient to answer all the queries, we further augment the query answering procedure with a recursive procedure. The recursive procedure is based on th idea of breaking the query into smaller assertions all the way until the information in the secrecy-preserving tree can be used

On the capture of two giant devil rays(Manta birostris(Walbaum)) at Veravel, Saurashtra

On 28 December 1961, the fishermen from Maharashtra who were engaged in line fishing at Veravel on the Saurashtra coast caught a gigantic devil ray

Inverse Anticipating Synchronization

We report a new type of chaos synchronization:inverse anticipating synchronization, where a time delay chaotic system can drive another system in such a way that the driven system anticipates the driver by synchronizing with its inverse future state. We extend the concept of inverse anticipating chaos synchronization to cascaded systems. We propose means for the experimental observation of inverse anticipating chaos synchronization in external cavity lasers.Comment: LaTex 6 pages, resubmitted to PR

Complexity cores in average-case complexity theory

Complexity cores in average-case complexity theory In average-case complexity theory, one of the interesting questions is whether the existence of worst-case hard problems in NP implies the existence of problems in NP that are hard on average. In other words, `If P ≠NP then NP is not a subset of Average-P\u27. It is not known whether such worst-case to average-case connection exists for NP. However it is known that such connections exist for complexity classes such as EXP and PSPACE. This worst-case to average-case connections for classes such as EXP and PSPACE are obtained via random self-reductions. There is evidence that techniques used to obtain worst-case to average-case connections for EXP and PSPACE do not work for NP. In this thesis, we present an approach which may be helpful to establish worst-case and average-case connection for NP. Our approach is based on the notion of complexity cores. The main result is `If P ≠ NP and there is a language in NP whose complexity core belongs to NP, then NP is not a subset of Average-P\u27. Thus to exhibit a worst-case to average-case connection for NP, it suffices to show the existence of a language whose core is in NP

Effect of Tetrahydrocurcumin Compared to Curcumin in Carbohydrate Metabolism and Glycoprotein Components in Type 2 Diabetes - Systematic Review

Pancreatic β-cell dysfunction and insulin resistance are the two hallmarks of type 2 diabetes mellitus. Treatment of diabetes without any side effects is still a challenge to the medical system. There is an increasing demand by patients to use the natural products with antidiabetic activity, because insulin and oral hypoglycemic drugs are having so many side effects. Curcumin is a biologically active component isolated from the rhizome of Curcuma longa that possess antidiabetic and has been proven scientifically to possess high antioxidant activity and anticancer properties. Tetrahydrocurcumin (THC) is a major curcuminoid metabolite of curcumin, naturally occurring in turmeric. The interest in THC research is increasing because it is superior to curcumin in its solubility in water, chemical stability, bioavailability, and anti-oxidative activity. Many in vitro and in vivo studies have revealed that THC exerts antidiabetic effects through various mechanisms, including modulation of oxidative stress, xenobiotic detoxification, inflammation, proliferation, metastasis, programmed cell death, and immunity. The activities of glycolytic enzymes such as hexokinase and glucose-6-phosphate dehydrogenase were found to be decreased whereas the activities of gluconeogenic enzymes (glucose-6-phosphatase and fructose-1,6-bisphosphatase) and polyol pathway enzyme-sorbitol dehydrogenase were significantly increased in diabetic control rats. In addition, the oligosaccharide moieties of glycoproteins (hexose, hexosamine, fucose and sialic acid) were also significantly increased in plasma and tissues of diabetic control rats. THC and curcumin administration to diabetic rats significantly reversed the above changes when compared to diabetic control rats. In diabetic controls, hepatic and skeletal muscle glycogen content was decreased significantly as compared to non-diabetic controls. Treatment with THC and curcumin increased the hepatic and skeletal muscle glycogen significantly. The antidiabetic and antioxidant effects of THC are more potent than those of curcumin at the same dose. The antihyperglycemic action of THC might be mediated via an enhancement of insulin action, as it is evidenced by the increased levels of insulin in diabetic rats treated with THC, which may be responsible for the reversal of changes in carbohydrate enzymes and glycoprotein components. The THC administration showed more effective than curcumin